期刊
HIGH ENERGY DENSITY PHYSICS
卷 9, 期 3, 页码 542-547出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.hedp.2013.05.010
关键词
Non-Maxwellian electron distribution; Non-LTE; Time-dependent atomic kinetics
资金
- Spanish Ministerio de Educacion, Cultura y Deporte [ENE2012-32108]
- European Commission project INREX-LASERLAB III
The interaction of high intensity X-ray lasers with matter is modeled. A collisional-radiative time-dependent module is implemented to study radiation transport in matter from ultrashort and ultra-intense X-ray bursts. Inverse bremsstrahlung absorption by free electrons, electron conduction or hydrodynamic effects are not considered. The collisional-radiative system is coupled with the electron distribution evolution treated with a Fokker-Planck approach with additional inelastic terms. The model includes spontaneous emission, resonant photoabsorption, collisional excitation and de-excitation, radiative recombination, photoionization, collisional ionization, three-body recombination, auto-ionization and dielectronic capture. It is found that for high densities, but still below solid, collisions play an important role and thermalization times are not short enough to ensure a thermal electron distribution. At these densities Maxwellian and non-Maxwellian electron distribution models yield substantial differences in collisional rates, modifying the atomic population dynamics. (C) 2013 Elsevier B.V. All rights reserved.
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